Adjusted lighting code to work with the end.
Added a dimension option for the Minecraft world class.
Added a dimension config option.
Applied new dimension option and end lighting fix.
Documented new dimension option.
Attempt to fix a texture issue causing segfaults (issue #61).
Fixed compilation problem.
Added copyright notice to textureimage.h/cpp.
Merge branch 'refactoring'

Conflicts:
	src/renderer/tilerenderworker.cpp
Updated readme and version file to 1.2.
s/Minecraft World/Minecraft world/
Removed newline from version file (just in case).
Removed old todo file.
Added fixed texture bug to version history.
Changed behavior of World class a bit.
You have to specify the path to the world in the constructor.